/*
Copyright (c) 2009 Hayden Curran <haydenz@gmail.com>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
        this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
        this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
    * The names of its contributors may not be used to endorse or promote
        products derived from this software without specific prior
        written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef _BUFFER_H
#define _BUFFER_H

// Buffer length
#define BUFFER_LENGTH 4096
// Packet length
#define PACKET_LENGTH 512

#include <string.h>

// Circular buffer yay
typedef struct {
    char buf[BUFFER_LENGTH];
    char *start;
    char *end;
} buffer_t;

/*
    Initialises the buffer_t struct
*/
int buffer_init(buffer_t *buffer);
/*
    Adds buf to the end of our buffer
    Returns -1 if not enough space to store it
*/
int buffer_receive(buffer_t *buffer, char buf[], int len);
/*
    Removes 1 packet from the buffer and puts it into packet
    Returns the length of the returned packet
    If the packet is incomplete returns -1
*/
int buffer_get_packet(buffer_t *buffer, char *packet);
/*
    Returns the length of the buffer
*/
int buffer_length(buffer_t *buffer);

#endif // _BUFFER_H
